If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

ATI Radeon causes trouble with SAMSUNG LED-TV UE40B6000

My graphics adaptor is driving me mad. I had planned to use my Samsung LED-TV (UE40B6000) as a secondary display connected to the DVI port (my 5:4 display is connected to the VGA port). But there are only two modes I can get it to work with: 1280x1024@60Hz and 1280x1024@75Hz. _All_ of the other modes produce a "unsupported video mode" on the TV screen.

Now here's the thing, it works fine under Windows, I can easily set the LED-TV to 1920x1080@60Hz as described in the TV's manual, i.e. just choose the settings under Windows (no extra driver required).

So, I thought I might have messed up my Ubuntu system some way. I tried with both Ubuntu 10.04 and openSUSE 11.3 live CDs producing the exact same results - only 1280x1024 produces a picture.

I switched modes using the "gnome-display-properties" tools which reports a Samsung Electric Company 7" display offering all the modes it should (incl. 1920x1080@60). As this didn't work I used xrandr to switch with the same results.

Detaching the display on VGA-0 did not change anything either. In that scenario the SAMSUNG LED-TV did not produce any picture at all. It just switched from "no signal" to "unsupported video mode". Sigh, if it only was telling me which mode it thinks it's receiving.

After that I started fiddling with a /etc/xorg.conf file for the better part of last night with ModeLines and suggestions (gtf ...) from all across the internet, too numerous for me to remember, especially since I basically took whatever came along (not a very structured approach - I know, but I got somewhat desparate). Nothing worked, nothing at all.

So at this point I am frustrated and just hope that someone can shed some light on my predicament. What bothers me most that Windows worked out of the box and Linux not at all...

Well, the modeinfo line it gets from EDID seems reasonable. It might be a bug in radeon, at least on my monitor (24" Asus LCD on 5850 over DVI) the monitor reports an "unsupported resolution" of 1922x1200 despite the computer thinking it runs in 1920x1200. As I have picture I haven't bothered to file a bug report, but it's possible that it's something like that and your TV handles it less well...

Well, the modeinfo line it gets from EDID seems reasonable. It might be a bug in radeon, at least on my monitor (24" Asus LCD on 5850 over DVI) the monitor reports an "unsupported resolution" of 1922x1200 despite the computer thinking it runs in 1920x1200. As I have picture I haven't bothered to file a bug report, but it's possible that it's something like that and your TV handles it less well...